Java Codelab 新行

Question

如何使我的输出符合预期？为了更清楚地说明，如何使输出“It·will·take9.090909090909091E-4·秒”与其他所有内容在同一行而不是新行？

预期输出:

输入以下其中一项:·空气、·水或·钢:·输入声波传播的距离:··将花费·9.090909090909091E-4·秒。↵

实际输出:

输入下列之一:·空气、·水或·钢:·输入·距离·声波·意志·旅行:↵·它将·需要9.090909090909091E-4·秒。

特殊符号说明:符号 含义· 空间字符↵ 换行符 (\n)→ 制表符 (\t)← 回车符 (\r)

import java.util.Scanner; //Scanner for input
//Class name
public class TESTTEST
{
public static void main(String[] args)//main section
{
    //varibles
    String speed;
    double distance;
    double time;
    //set scanner
    Scanner keyboard = new Scanner(System.in);
    //ask for the type of speed input
    System.out.println("Enter one of the following: air, water, or steel: "
            +"Enter the distance the sound wave will travel:");
    speed = keyboard.nextLine();
    distance = keyboard.nextDouble();
    if (speed.equals("air") || speed.equals("water") || speed.equals("steel"))

     //set switch
     switch (speed)
     {

        case "air":
           time = distance/1100;
           System.out.print(" It will take" + time + " seconds.");
           break;
        case "water":
           time = distance/4900;
           System.out.print(" It will take" + time + " seconds.");
           break;
        case "steel":
           time = distance/16400;
           System.out.print(" It will take" + time + " seconds.");
           break;
         default:System.out.print("Sorry, you must enter air,water,or steel.");

}
}
}   

Answer 1

在这种情况下，即使 System.out.print("Enter one of the following ...); 也不起作用，因为您正在使用 Scanner 并期待用户的输入。输入完毕后，用户需要按键盘的 ENTER 键将控制权交给程序，这将在控制台中产生 new line 。